Rotary cutting-off saw and the like.



G. GORTON. ROTARY CUTTING-OPP SAW AND THE LIKE. APPLIGATION FILED NOV.11, 1912.

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WITNESSES a a 5M G. GORTON. ROTARY CUTTING-OFF SAW AND THE LIKE.

APPLICATION FILED HOV.11 1912.

Patented Nov. 4, 1913.

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Attorney M G. GORTON. ROTARY CUTTING-OFF SAW AND THE LIKE.

APPLICATION FILED NOV.11, 1912. v 1,077,271. PatentedNov. 4, 1913.

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COLUMBIA PIJANOGRAPM COHVIASHIINOTUN. D. C

GEORGE GORTON, OF RACI NE, WISCONSIN.

ROTARY CUTTING-OFF SAW AND THE LIKE.

Patented Nov. 4, 1913. Serial No. 730,755.

To all whom it may concern:

Be it known that I, GEORGE GoRroN, a

. pression of my invention from'among other format-ions, arrangementsand constructions within the spirit and scope of the invention.

An object of the invention is to provlde improvements in theconstruct-ion of rotary cutting-off saws for the purpose of attainingeconomy in the matter of cutter upkeep or maintenance.

A further object of the invention is to provide improvements in theconstruction of rotary cutting off saws for the purpose of attainingfacility in making repairs and economy in saw blade up keep. I

A further object of the inventlon is to provide improvements in theconstruction of rotary cutting off saws involving advantageous featuresin the matter of radial cutter adjustment. I

A further object of the invention is to pro vide certain improvements inarrangements of parts and details of construction whereby lghlyefficient and improved rotary cut-j 0f the internal type will be protingoif saw uced.

The invention consists in certain novel features in construction and incombinations and arrangements as more fully and particularly set forthhereinafter.

Referring to the accompanying drawings: Figure l, is an elevation of asaw constructed in accordance with my invention. Figs. 2, 3, 4, 5, and6, are detail views. Fig. 7, is a section on the line 7-7, Fig. 1. Fig.8, is a section on the line 88, Fig. 1. Fig. 9, is a detail sectionalView of portions of the blade and a cutter and an adjusting or endthrust block for said cutter. Fig. 10, is an elevation of amodification, and Figs. 11 and 12, are details thereof.

The example illustrated by Fig. 1, shows a cumferential or outer outerend portion to saw, (having a central work receiving openmg a,) composedof a number of similar in terchangeable blade sections 1, interveningcutters 2, comparatively short keys or wedges 3, backing the inner endportions of the cutters, and end thrust blocks for the cutters. In theexample given, Fig. 1, the

saw blade is made up of ten or sector-shaped sections 1,

similar sectors each extending from the outer edge to the lnner edge ofthe blade, and at its inner end tion of the inner edge of the blade andat its outer end forming a portion of the outer or circumferential edgeof the blade. The blade is adapted to be fixedly, yet removably, clampedor otherwise secured around its ciredge portion to a rotary drivingdrum. For instance, I show each section provided with holes 5, in itsreceive securing means such as bolts and pins, whereby each bladesection is removably secured and can be independently removed from andapplied to the driving drum, when the adjacent cutter forming a porisnot inoperative position. In this example, each cutter 2, consists of anelongated element of high speed or other required steel or metal at itsinner oblong block, body or end formed with the working or cuttingpoint. Every alternate cutter has a com- ,paratively Wide short workingpoint 6, and

every intervening cutter has a comparatively long narrow working point60. The cutter blocks or bodies preferably have parallel longitudinaledges 7, and these edges are .usually either longitudinally grooved orribbed to fit correspondingly formed edges of the blade sections andkeys to hold the cutters and blades against lateral deflection and toproperly center said parts when tightened.

The cutters are arranged radially of the blade and between the bladesections thereof, and in the example of Fig. 1, each blade section israbbeted or cut away at its front longitudinal edge portion to form aradially elongated cutter pocket having longitudinal rear wall 8, andtransverse outer end wall or abutment 9,, while the front Wall of thepocket is formed by the rear longitudinal or radial edge 10, of theadjacent front blade section. Each blade section has the short radial orlongitudinal edge 11, extending outwardly from the end wall 9, to theouter and edge of the section. The short front edges 11, of the bladesections are formed to abut squarely and tightly against the outer endportions of the long rear radial edges 10, when the parts are assembled.The elongated cutter blocks are arranged in said pockets and are tightlylocked to and with the blade sections short keys or wedges 3, drivenlongitudinally of the cutters between their rear edges and the frontedges 8, of the blade sections. These keys have their longitudinal edgesgrooved or ribbed to intermesh with the correspondingly formed cutterand blade section edges to center the parts and hold them againstlateral deflection. The rear edge 10, of each section is alsolongitudinally grooved or ribbed to inter-mesh with the frontlongitudinal edge of each cutter against lateral deflection. Theseinter-meshing edges permit longitudinal movement of the keys and cuttersfor adjustment and tightening. The front edge of each section, at apoint about midway the length of the cutter pocket, is formed with anoffset forming a transverse opening 13, at the outer (small) end of thekey and at the rear edge of the cutter. This opening 13, gives access tothe small end of the key or wedge for driving the same inwardly topermit loosening or removal of the cutter. The portion of the cutter(toward the floor 9) beyond opening 13, directly engages and fits theparallel edges of the adjacent blade sectors. The cutters are sharpenedby grinding at the points, and hence the cutters are being constantlyreduced in length by reason of the excessive duty and consequent wear towhich they aresubjected. The cutters are made of very expensive materialand the cutters are expensive to produce. The saw blades are alsoexpensive, sirable to reduce to the minimum all liability of damage tosaw blades. It is also exceedingly desirable to economical saw upkeep,that the life of each cutter be prolonged to the maximum. I hence haveprovided exceedingly long cutter blocks so that a cutter can besubjected to long continued wear before becoming worn out.

In the particular example illustrated, each cutter when new presentssurplus stock or length approximately equal to the distance from theperforation 13, to the outer or rear end of the cutter block, 2'. e. theend of the cutter toward the pocket floor. In other words, the cuttercan be adjusted inwardly as its point wears away, until the heel orouter end of the cutter approximately reaches the perforation 13, orsmall end of the cutter locking key. Usually in cutting off saws, theinserted cutters are worn out and must be discarded when reduced inlength through grinding by a fraction of an inc by the comparativelylocated outwardly and it is exceedingly de In heavy duty saws,constructed in accordance with my present invention, the cutters can beworn down or reduced several inches in length before they become wornout. For instance, in a saw of my invention, for severing twelve inchstock, the cutters can be made with approximately four inches reserve orsurplus length, and hence each cutter can be reduced by wear foul inchesin length before becoming worn out and discharged. Various means can beprovided under my invention for attaining these results and enabling meto utilize these excessively long cutters, and to reduce costof cutterand blade upkeep to the minimum. For instance, the radial adjustment ofthe cutters can be determined by removable adjustablecutter-end-thrustreceiving means arranged between the heels of thecutters and the pocket floors 9, and capable of being built up orincreased in length as the cutters wear so that the point of each cuttercan be maintained at the required distance from the axis of rotation ofthe saw notwithstanding the reduction in the length of the cutter bywear.

ing means can con ist of blocks, fillers or the like, interposed in thepockets between the floors 9, and the cutter heels. Interchangeableremovable blocks or fillers of different sizes or lengths can beprovided. I usually provide a set of fillers or blocks 14, of differentsizes for each cutter pocket. Each fill-er is formed at its edges toproject into the grooved edges 8, 10,01 the adjacent blade sections andbe thereby held against lateral deflection and permit the slippedlongitudinally into or from the pocket when the cutter is removed. Thetiller can be provided with a center longitudinal tapped socket 15-,(see Fig. 9) to adjustably receive a screw or pin 16, to form theabutment between the block and the cutter. Slight adjustments can bemade by this screw. For instance, where all of the cutters in a bladeare approximately of full length, the smallest blocks 14:, of the setsof blocks will be placed in the cutter pockets and any necessaryadjustments can be effected by the screws 16.

When the sectors of a blade are all secured at points 5, to the rotarydriving drum, the blocks 1d can be slipped into the cutter pockets andseated against floors 9, the cutters can then be slipped into saidpockets and seated against the abutment screws 16, and the keys orwedges 3 can then be slipped into the pockets behind the cutters anddriven home to tighten the cutters and sectors to the necessary degree.These keys tightly and rigidly lock the in ner ends of the blade sectorstogether with the cutters and a most strong rigid strut ture is therebyproduced. If for any reason, the saw blade should be damaged as by Theadjustable cutterend-thrust-receivblock to be i res cutter, or should ata pocket by the broken off point of a become bell mouthed reason ofcutter breakage or other causes, the blade sectordisclosing such injurycan be readily located and removed without removing or disturbing theremaining sectors, and a perfect sector can be substituted at slightexpense in comparison with the expense of replacing an entire blade. Anycutter can be separately or independently adjusted or removed after itslocking key has been loosened or removed. The end thrust blocks are alsoremovable and interchangeable.

When any cutter becomes so worn by fre quent grinding or otherwise thatthe range of adjustment of the screw 16, in its end thrust block isinsufiicient to maintain the cutter projected inwardly the requireddistance to properly locate its point in the work receiving opening a,the cutter, and such block are removed, and the next size larger orlonger end thrust block is placed in the pocket to receive such worncutter and compensate for reduction in the length of the cutter by wearand build up a' thrust element of the required length between the floor9, and the heel of the cutter.

Each set of blocks can be made up ofany suitable number of progressivelylonger, or larger blocks. For instance, in a saw where each cutter canbe worn down approximately four inches, I can provide six end thrustblocks 14, 14 14", 14, 14 14 for each cutter ranging from the smallblock 14, having a length of about one inch and a quarter to the largestblock 14 having a length of about four inches and three quarters, witheach block about three quarters of an inch longer than the precedingblock. Each block will have the longitudinal tapped hole or socket toreceive an adjustable abutment 16, so that each block can be built up toany accurate fractional length necessary for out ter adjustmentapproximately within the three quarters inch limit or whatever ma be thedifference in block lengths.

If so desired, each blade section can be formed with a transverse recessat the inner end of its pocket floor 9, to form a trans verse opening 17into which an implement can-be inserted under the end thrust blockthereon to facilitateremoval thereof.

If so desired, each adjustable abutment screw 16, can be composed of arelatively soft metal, to compress or upset under abnormal or excessiveendwise thrust of the cutter abutting the same. Under certain abnormalconditions a cutter is subjected "to excessive endwise pressure whichwould result in cutter or blade damage unless relieved. When theabutment screws 16, are made of copper or other relatively soft metal, acutter can move longitudinally and relieve such pressure where it is soexces- Damaged upset screwssive as to be able toovercome the resistingpressure of the cutter locking key and cause compression or upsetting ofthe screw. can be easily re placed at slight expense. However, I do notwish to limit all features of my invention to such relatively softabutments, and even where soft abutments are employed soft metal pinscan be used instead of screws and fractional adjustment can be providedfor by grinding instead of by screw threaded pins (screws).

Various arrangements and provisions can be utilized to cause all of thenarrow point cutters to project the same distance intothe work receivingopening, and all of the wide point cutters to uniformly project aslightly less distance into said opening than the narrow cutters. Thesedifierences can be provided for by the end thrust radial adjustmentdetermining devices, or by differences in the lengths of the cutterblocks, or bv' locating the floors or abutments 9, diifererit distancesfrom the axis of rotation of the saw.

The projection of the narrow points" beyond the wide points is veryslight, and

I prefer to originally or initially makeall the cutter blocks fulllength and accurately, of the same length, and all of theblocks orfillers 14, accurately the same length, and. to provide for saiddifference between wide and narrow points, by locating the pocket floors9, for the narrow point cutters, the

slight fraction of an inch nearer the axis inwardlybeyond the widepo1nts.-'

The floors 9, can be accurately located in making the blade sectors, sothat half the,

number of blade sectors of a saw will have their floors 9, located avery slight fraction of an inch nearer the outer edges of the sectorsthan the floors of the remaining blade.

I can fix a cutter from utilize a gage or sectors. By this arrangement,certain accurate length for each pomt to floor 9, and can other deviceby which each cutter can be measured up to determine theexact lengththat the end thrust element or filler must build up in order to fill orsupply the dif- I ferences between what the cutter measures and saidcertain accurate length required, as it is apparent that when cuttersare sharpened after use no two cutter bodies will be of uniform lengthand such uniformity in length must be attained by means of adjustingblocks 14 or their equivalent.

Instead of manufacturing the blade sectors of a saw with differentlylocated floors 9, as just described, to determine the differentprojections of the cutter points, I can make all of the sectors ofa'blade exactly alike with their pocket floors 9, all similarly locatedand then can fix end thrust or abutof rotation than the floors 9, of thewide point cutters, that the narrow points projectment blocks ofd-ifierent sizes or lengths on said floors to attain the differentelevations that determine the difierent projections of the cutterpoints. In other words, one half of the number of blocks or abutmentswill be the fraction an inch longer or wider than the remaining blocks,that the narrow point cutters are to project beyond the wide pointcutters; This will enable me to make the cutter blocks all accurately ofthe same length and to fix one accurate length for the distance thepoint of every cutter must be from its said fixed block or abutment. Ican utilize blocks or abutments 20 (see Figs. 3 l) for thus building upthe floors 9, to diilerent elevations and can fix these blocks to theblade sectors by machine screws 21 (see Fig. 3) extending through theblocks and into the floors 9. However, where the blade sectors are madewith the cutter pockets all accurately of the same depth, 5. c. thefloors 9, all located alike, the cutters can be all accurately of thesame length, and the narrow pointcutters can be projected the desireddistances beyond the wide point cutters by setting the screws 16, of thenarrow point cutters differently from the screws 16, behind the widepoint cutters. Building up or filling blocks such as 14:, havingadjustable screws 16, can be used in connection with such fixedabutments 20, to com iensate for cutter wear. Instead of employingblocks such as 1%, with screws, I can employ sets of blocks, plates,fillers, or shims22, ranging in width from several thousandths of aninch, if need be, up to one or more inches. These fillers 22, can beshaped like the blocks 14, but without the adjustable screws or abutnients and hence the very thin or narrow fillers are necessary to getthe fine accurate measurements or adjusti'nci'its. By employing asuitable gage, the operator can easily determine the length of backingor filling means required to build a. worn cutter up to the lengthrequired from point to cutter pocket floor or to block 20.

I do notwish to limit all features of my invention to use in connectionwith a saw blade made up of sectors or other removable sections, nor doI wish to limit all features 01- my invention to the particular insertedcutters and means for maintaining radial adjustment thereof. Variousother sectional blade arrangements might be employed and other bladesection securing means might be employed and inserted cutters might bevariously arranged with respect to the blade sections, and various meansmight be employed for locking or tightening the cutters and bladesections. For instance, among other different blade formations thatmight be employed, in Figs. 10, 11 and 12, I show an arrangement whereinevery alternate blade sector 30, is similar and at both edges withcutter pockets, while the intervening blade sectors 31, are similar toeach other and do not carry cutters but constitute radially adjustablewedging or key ing sections for locking the cutters and blade sectorstogether. The sectors 30, are removably bolted at their outer ends byscrews 33, (or otherwise clamped or secured) to the rotary driving drum32. Each sector 30, carries two removable adjustable cutters 34:, suchas hereinbefore' described, arranged at the opposite longitudinal edgesof the sector. Both side edges of each sector 30, are formed with cutterpockets such as described in connection with Fig. 1, having abutmentfloors 35. The longitudinal edges 01. the cutters are ribbed ashereinbefore described, and the edges of the blade sections are groovedto receive said ribbed edges of the cutters. edges or keys 3, are notemployed, but the sectors 31, engage the cutters and edges of sectors30', and on being forced radially toward the axis of rotation, act askeys or wedges to lock the cutters and sectors together to constitute astiil rigid saw blade structure.

Various means can be employed for adjusting the sectors 31 radially ofthe saw for locking and releasing the cutters. For instance, I showbolts 36, extending longitudinally through the drum and at the rear endof the drum provided with rotary threaded sleeves Or nuts 37 whereby thebolts can be moved longitudinally in the drum. At their front ends saidbolts are provided with wedges 38, arranged in notches 39, in the outeredge portions of the sectors 31. The wedge portions of these bolts areadapted to engage beveled edges is provided 40, of said sectors when thebolts are drawn rearwardly and thereby force said sectors inwardly tolock the cutters and sect-ions of the saw in operative adjustment. Whenthe bolts are moved inthe opposite direction the blade sections andcutters are loosened. The sectors 31, are centered and guided in theirradial movements by the projecting ends of sleeves 4C1, fixed in thedrum and fitting in the slots or notches 39. I usually provide severalwedge or tight ening bolts for each sector 3-1, and it will be notedthat the sectors 31, can be inde pendently adjusted.

In Fig. 1, of the drawings, I show several new or full lengthcutterbodies or elements 2, backed only by the end thrust elements 1 1, andtheir abutment screws. and I also show the remainingcutters of down bygrinding to various reduced lengths and built up by the various fillersor' end thrust elements 14 14L", 14, 14 and 14 and their abutment screwsto attain the required radial adjustment or positions of the workingpoints of such worn cutters. At the right hand side of Fig. 2, I show aset the saw worn ire ire

7 without departing from the spirit and scope abutment screws 16. 7however, I wish to state that all features of of fillers 14?, etc., eachbeing partially broken away and arranged to indicate how they can besuccessively utilized to build up the cutter bodyof Fig. 2, as it isgradually reduced inlength to the transverse dotted line.

In Fig. 3, I "indicate by a transverse dotted line, which the cutterbody can be gradually built up by the fillers of either Figs. 2, or 4,as it is reduced in length by repeated. grindings. v I In Fig.4, I showthe cutter approximately worn down to its minimum length and built upby. the system of fillers-22, including the very thin or graduated shimswhereby very fine adjustments are attained instead of the In thisconnection,

my invention are notllimited to the employment of the elongated cutterbodies or to cutter bodies interposed between the saw bladesector-shaped sections, inasmuch as such sections can receive radiallyarranged inserted cutters in pockets located intermediate thelongitudinal edges of the sections, and said sectionsoan be tightened byinterposed wedges or keys, or as illustrated by Fig. 10.

It is evident that various changes, variations, and modifications mightbe resorted to of my invention as set forth in the claims heretoannexed. and hence I do not wish to limit myself to the particularmechanical expressions of my invention disclosed hereby.

Desiring to protect my invention in the broadest manner legallypossible, what I 7 claim 1s 1; A rotary cutting-off saw comprising ablade having a central work-receiving opening, and cutters carried bysaid blade and arranged around and projecting into said Opening, saidblade composed of sectorshaped removable sections and means for wedgingthe same tightly together. i

2. A rotary cutting-off saw comprising a blade having a centralwork-receiving opening and composed of removable radially arrangedsections, each extending from the the outer edge thereof and at itsouter end formed to receive securing means, interposed removableinserted cutters, and locking keys for rigidly wedging the cutters andsections toj gether.

3i A rotary cutting on saw having a central work-receiving opening, and.composed of series of abutting sectors, interposed cutters and lockingkeys.

4:. A rotary saw blade; composed of abutting sector shaped sect-ions andinserted cutters rigidly wedged and locked together.

5. A rotary saw blade composed of revmovable sections, andinterposedradiallyarranged removable inserted cutters rigidly approximately thepoint to composed wedged to the sections to lock the sections andcutters together. 6Q Arotary saw blade having a central worloreceivingopening and composed of removable sector-shaped sections tightly .locked'and wedged together and at their outer ends formed for securing to arotary driving drum.

7. A rotary saw blade having a central work-receiving opening andprovided with cutters arranged around and projectingv into sa1d opening,sa1d blade composed of removable radially-arranged sections at theirouter ends formed for securing to a rotary driving drum and locking keystightly wedging the sections to form a rigid blade.

8. A rotary cutting-01f saw blade carrying, tightly-wedged insertedcutters and of a series of separate sectorshaped sections abutting attheir longitudinal edges and tightly wedged together to form a rigidblade.

A rotary cutting of? saw blade composed of a series of separatesections, each section forming a sector of the blade and at its innerend having a cutter pocket, said sections abutting at their longitudinaledges, inserted cutters, and locking wedges.

10. A rotary cutting off saw comprising a blade composed of a series ofseparate removable sections, inserted cutters at the inner ends of saidsections, and locking means to tightly wedge saidsections and the cutters together.

11. A rotary cutting ofi sawcomprising a blade composed ofseparatesections abutting at their. longitudinal edges, insertedremovable cutters arranged between the longitudinal edges of thesections, and locking means for tightly wedging the sections and cutterstogether for operation.

12. A saw blade composed of sections,interposed removable insertedcutters, and wedging means whereby the sections and cutters can betightly locked together to form a rigid blade.

13. A rotary cutting ofl' saw comprising a blade composed oftightly-wedged abutting s ections, said sections having their edgesrecessed to form. intervenin cutter pockets, and inserted cutters adapteto said pockets.

14. A saw blade composed of separate sections, interposed insertedremovable cutters,

. and wedging means for locking the sections and cutters together, thelongitudinal engaging edges of the wedging means, cutters and sectionsbeing correspondingly grooved and ribbed to maintain the parts againstlateral displacement. and to permit longitudinal adjustment of thecuttersbetween the sections. v

;15. A rotary cutting off saw comprising a blade having elongatedradially arranged cutter pockets, elongated inserted removable Circutters arranged in said pockets and ad justed longitudinally thereof,adjustable wed-ging means for locking the cutters in operative positionin the blade, and remov able means for sustaining the longitudinalthrust of each cutter and adapted to be built up to compensate for thereduction in cutter length due to wear.

16. A rotary cutting off saw comprising a blade having elongatedradially arranged cutter pockets formed with abutment floors,- elongatedcutters all of the same length from point to heel and adapted to saidpockets and adjustable longitudinally thereof to take up wear due togrinding the points thereof, and adjustable means for filling the spacein said pockets between said floors and the cutter heels to determineradial cutter adjustment and to sustain the longitudinal thrust of thecutters.

17 A rotar 1 cutting off saw comprising a blade having radially arrangedcutter pockets formed with fixed abutment floors, certain of said floorsbeing arranged at the same distance from the axis of rotation and theintervening remaining floors being uniformly arranged at a diiferentdistance from the axis of rotation, inserted cutters adapted to saidpockets, said cutters being all of the same length from point to heel,said cutters adapted to be adjusted longitudinally in said pockets asthey are reduced in length by sharpening, and a series of thrust blocksadapted to said pockets between said abutment floors and the heels ofthe cutters, said thrust blocks adapted to sustain the end thrust of thecutters and to determine the radial adjustment thereof.

18. A rotary cutting off saw having cutter means for locking the cuttersin the pockets, and thrust blocks of various lengths adapted to beinterposed in said pockets between the floors thereof and the heels ofthe cutters to sustain the longitudinal thrust of the cutters and todetermine the radial adjustment thereof, said blocks being adjustableand removable to compensate for the reduction in length of the cuttersby repeated sharpening;

19. A rotary cutting off saw comprising a saw blade composed of sectionsand providing cutter pockets between the sections, elongated insertedremovable cutters arranged in said pockets and interposed between saidsections, means for locking the sections and cutters together foroperation, and sets of thrust blocks of different lengths adapted tofill the pockets between the floors thereof and the heels of thecutters.

2-0. A rotary cutting off saw having elon gated radial cutter pocketsformed with floors, elongated cutters removably arranged in said pocketsand adjustable longitudinally thereof to take up wear due to sharpening,keys for removably locking the cutters in said blade, said pockets beinggreater in length than said keys, and means for determining radialcutter adji'istment and for sustaining the end thrust of the cutters,to-

ward said floors, said means adapted to be i built up as the cuttersdecrease in length.

21. A rotary cutting-off saw comprising a blade having elongated cutterpockets formed with floors, the longitudinal edges of the portion ofeach pocket adjacent to its floor being parallel, elongated cuttersremovably fitted in said pockets against lateral displacement, eachcutter having parallel longitudinal edges slidably engaging said pocketedges, means to lock the cutters in the pockets, and removable meansadapted to fill the space in the pockets between the floors thereof andthe heels of the cutters to determine cutter radial adjustment,

said means comprising compressible mem- 'bers.

22. A rotary cutting off saw having a blade with elongated cutterpockets, elongated insertible removable cutters adapted to said pockets,removable keys for locking the cutters in the pockets, said pocketshavmg floors spaced from the heels of the cut- I ters, the longitudinaledge walls of the pockets and of the cutters and keys beinglongitudinally grooved and ribbed to intermesli against lateraldisplacement, and removable thrust blocks determining cutter radial ad-.justment and filling in the space of each pocket between its floor andthe cutter heel and at its edges intermeshing with said edge walls ofthe pocket against lateral displace ment. pockets, cutters adapted tosaid pockets,

23. A rotary cutting oif saw comprising a jbl ade having elongatedcutter pockets, elongated cutters adapted to said pockets, means forlocking the cutters in the blade, and removable thrust blocks havingadjustable abutment screws for determining radial cutter adjustment,said blocks arranged between the floors of said pockets and the heels ofsaid cutters.

24. A rotary cutting off saw COIIIPI'lSlIlgEL saw blade having elongatedcutter pockets,

elongated cutters adapted to said pockets, means for locking each cutterin its pocket,

said cutters adapted to be adjusted longitudinally in said pockets andtoward the work as the cutters are reduced in length by grinding, and aseries of removable interchangeable differently sized thrust blocks forfilling the constantlyenlarging spaces between the floors of saidpockets and the heels of said cutters to determine cutter radialadjustment.

25. A rotary saw blade having a central work-receiving opening andcomposed of re 'movable abutting tightly-wedged sectorshaped sections,movable inserted said sections.

26. A rotary saw blade having a central work-receiving opening andradial pockets opening thereinto, radially-arranged inserted cuttersremovably and rigidly locked in said pockets with their Working pointsin said opening, said blade composed of removand radially-arrangedrecutters tightly locked to Copies of this patent may be obtained forfive cents each, by addressing the Washington, I). G.

GEORGE GORTON.

Witnesses C. R. CARPENTER,

E. S. GERE.

Commissioner of Patents,

